CN104267000A - Plastic optical fiber refractive index sensor on basis of micropore structure and preparation method and application thereof - Google Patents
Plastic optical fiber refractive index sensor on basis of micropore structure and preparation method and application thereof Download PDFInfo
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- CN104267000A CN104267000A CN201410584198.2A CN201410584198A CN104267000A CN 104267000 A CN104267000 A CN 104267000A CN 201410584198 A CN201410584198 A CN 201410584198A CN 104267000 A CN104267000 A CN 104267000A
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- micropore
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Abstract
The invention relates to a plastic optical fiber refractive index sensor on the basis of a micropore structure. The plastic optical fiber refractive index sensor comprises a plastic optical fiber used as a substrate and the micropore structure processed on the lateral surface of the plastic optical fiber; the axial direction of a micropore perpendicularly and transversely penetrates through the axial direction of the plastic optical fiber; a light source for providing an optical signal is arranged at one end of the plastic optical fiber; a power meter is arranged at the other end of the plastic optical fiber so as to detect power loss after the light source is spread by the plastic optical fiber. The plastic optical fiber adopted by the plastic optical fiber refractive index sensor is a low-loss optical waveguide and transmission loss in the optical waveguide is ignored under a certain length, and thus, loss of the optical fiber is only related to loss of a sensing head, namely loss of the micropore structure part. According to the invention, a machining method is utilized to make the micropore sensing structure on the lateral surface of the optical fiber; the plastic optical fiber refractive index sensor has the advantages of simple process, high productivity, low cost and the like; and excellent temperature stability enables the structure to have important application in detection of a refractive index.
Description
Technical field
The present invention relates to a kind of plastic optical fiber index sensor based on microcellular structure and preparation method thereof and application, belong to the technical field of sensor.
Background technology
Fibre Optical Sensor have highly sensitive, electromagnetism interference, resist chemical, size are little and the feature such as quick response.Compared with conventional quartz optical fiber, plastic optical fiber has that core diameter is large, toughness is high, cheap, make simple, easy maintenance, high reliability.Therefore, plastic optical fiber (POF) sensor is a kind of sensor of extensively research both at home and abroad at present.Wherein, the index sensor based on plastic optical fiber has very important application in various fields such as environmental monitoring, clinical examination, food inspection.But mainly there is following problem in the domestic and international research for optical fiber at present:
1) both at home and abroad the optic fibre refractive index sensor of report is most based on special optical fiber or interferometer structure, there is expensive, refractive index temperature and to accompany each other the problem such as sensitivity and poor stability;
2) research about plastic optical fiber is more, and the research being applied to refractive index sensing field is less.
Summary of the invention
For existing technical deficiency, the invention provides a kind of plastic optical fiber index sensor based on microcellular structure.
The present invention also provides a kind of preparation method of above-mentioned index sensor.
The present invention also provides a kind of method utilizing above-mentioned index sensor to measure liquid refractivity.The present invention has that technique is simple, throughput rate is high, cost is low, to the advantage such as temperature-insensitive and good stability.
Technical scheme of the present invention is as follows:
Based on a plastic optical fiber index sensor for microcellular structure, comprise as the plastic optical fiber of substrate and the microcellular structure in the processing of plastic optical fiber side, the axis of described micropore vertically crosses the axis of plastic optical fiber; Be provided with the light source that light signal is provided in one end of described plastic optical fiber, the other end of described plastic optical fiber is provided with power meter, with the power attenuation of detection light source after described plastic optical fiber is propagated.Plastic optical fiber of the present invention is that low-loss quasi-optical wave is led, and ignores the loss in optical waveguide under certain length, so the loss of optical fiber only and sensing head, namely the loss at microcellular structure position is relevant, and has nothing to do with the position of sensing micropore.
Preferred according to the present invention, described plastic optical fiber is the plastic optical fiber of diameter 0.5mm.
Preferred according to the present invention, described plastic optical fiber is the EL250 plastic optical fiber that Mitsubishi company produces.
Preferred according to the present invention, the parameter of described plastic optical fiber: core is PMMA, covering is fluororesin; Physical dimension is 480/500 μm; Fiber core refractive index 1.49, fibre core numerical aperture (NA) is 0.5, cladding index 1.40; Transmittance/%*m
-1>=95 (570nm), loss/dB*km
-1≤ 200 (570nm); Wavelength coverage is 420-680nm, Applicable temperature-20 DEG C ~ 70 DEG C.
Preferred according to the present invention, the aperture of described micropore is 0.1-0.4mm.
Preferred according to the present invention, the aperture of described micropore is 0.35mm.When micropore size is 0.35mm, the bright sensitivity of sensor is the highest.
A preparation method for above-mentioned index sensor, adopt the method for existing machinery processing to cross covering and the fibre core processing micropore of whole plastic optical fiber, the axis of described micropore vertically crosses the axis of plastic optical fiber.The present invention adopts the method for existing machining to be made.Have technique simple, throughput rate is high, low cost and other advantages.
Utilize above-mentioned index sensor to measure a method for liquid refractivity, comprise step as follows:
1) wavelength is that to be coupled to one section of internal-and external diameter through optic fibre input end mouth be in the plastic optical fiber of 480/500 μm for the LED light source of 652nm, and transmits in plastic optical fiber having under covering constraint;
2) light is behind the described micro-porous area of arrival, and light reflects through the negative lens effect of micropore, and outwards disperses and make total reflection condition destroyed, causes being optical coupling out plastic optical fiber;
3) when filling the liquid of different refractivity in micropore, its negative lens effect can be different, and then the refraction path of light can be different, and the loss of the light caused can be different; By detecting the loss receiving light, realize the Real-Time Monitoring to refractive index in micropore.
Preferred according to the present invention, extraneous testing liquid flows in described micropore by micro fluidic device; And then realize the quick Real-Time Monitoring of testing liquid refractive index to external world.
Advantage of the present invention:
(1) the present invention adopts plastic optical fiber as sensor fibre, has the advantage that core diameter is large, toughness is high, cheap, making is simple, easy maintenance, reliability are high;
(2) the present invention utilizes mechanical processing method to make microcellular structure in plastic optical fiber side, and have technique simple, throughput rate is high, low cost and other advantages; And found the preferred pore diameter range of micropore, to obtain the best effects of measurement.
(3) the present invention makes testing liquid by microcellular structure by simple and easy microfluidic device, can realize the Real-Time Monitoring to liquid to be measured.
(4) sensing arrangement based on micropore of the present invention's making, have good temperature stability, and refractive index is extremely responsive.
Accompanying drawing explanation
Fig. 1 is the structural representation of sensor of the present invention;
Fig. 2 is the micropore prepared on plastic optical fiber of the present invention, its pictorial diagram under the microscope, micropore front view (FV);
Fig. 3 is the micropore prepared on plastic optical fiber of the present invention, its pictorial diagram under the microscope, micropore outboard profile;
Wherein: 1, plastic optical fiber; 2, micropore;
Fig. 4 is the fundamental diagram of a kind of plastic optical fiber index sensor based on microcellular structure of the present invention;
Fig. 5 is that a kind of plastic optical fiber index sensor based on microcellular structure of the present invention is applied to refractive index sensing figure;
Fig. 6 is a kind of plastic optical fiber index sensor based on microcellular structure of the present invention its temperature stability test pattern when applying.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the invention will be further described, but be not limited thereto.
Embodiment 1,
As shown in Figure 1, 2, 3.
Based on a plastic optical fiber index sensor for microcellular structure, comprise as the plastic optical fiber of substrate and the microcellular structure in the processing of plastic optical fiber side, the axis of described micropore vertically crosses the axis of plastic optical fiber; Be provided with the light source that light signal is provided in one end of described plastic optical fiber, the other end of described plastic optical fiber is provided with power meter, with the power attenuation of detection light source after described plastic optical fiber is propagated.Described plastic optical fiber is the plastic optical fiber of diameter 0.5mm.The aperture of described micropore is 0.1-0.4mm.
Embodiment 2,
As described in Example 1 based on a plastic optical fiber index sensor for microcellular structure, its difference is, described plastic optical fiber is the EL250 plastic optical fiber that Mitsubishi company produces.
Preferred according to the present invention, the parameter of described plastic optical fiber: core is PMMA, covering is fluororesin; Physical dimension is 480/500 μm; Fiber core refractive index 1.49, fibre core numerical aperture (NA) is 0.5, cladding index 1.40; Transmittance/%*m
-1>=95 (570nm), loss/dB*km
-1≤ 200 (570nm); Wavelength coverage is 420-680nm, Applicable temperature-20 DEG C ~ 70 DEG C.
Embodiment 3,
As described in Example 1 based on a plastic optical fiber index sensor for microcellular structure, its difference is, the aperture of described micropore is 0.35mm.
Embodiment 4,
A preparation method for index sensor as described in embodiment 1-3, adopt the method for existing machinery processing to cross covering and the fibre core processing micropore of whole plastic optical fiber, the axis of described micropore vertically crosses the axis of plastic optical fiber.
Embodiment 5,
Utilize index sensor as described in embodiment 1-3 to measure a method for liquid refractivity, comprise step as follows:
1) wavelength is that to be coupled to one section of internal-and external diameter through optic fibre input end mouth be in the plastic optical fiber of 480/500 μm for the LED light source of 652nm, and transmits in plastic optical fiber having under covering constraint;
2) light is behind the described micro-porous area of arrival, and light reflects through the negative lens effect of micropore, and outwards disperses and make total reflection condition destroyed, causes being optical coupling out plastic optical fiber;
3) when filling the liquid of different refractivity in micropore, its negative lens effect can be different, and then the refraction path of light can be different, and the loss of the light caused can be different; By detecting the loss receiving light, realize the Real-Time Monitoring to refractive index in micropore.
Extraneous testing liquid flows in described micropore by micro fluidic device; And then realize the quick Real-Time Monitoring of testing liquid refractive index to external world.
As shown in Figure 4, principle of work of the present invention: wavelength is that to be coupled to one section of internal-and external diameter through optical fiber entry port 1 be in the plastic optical fiber of 480/500 μm to the LED light source of 652nm, fiber core refractive index 1.49, and fibre core numerical aperture (NA) is 0.5, cladding index 1.4, transmittance/%*m
-1>=95 (570nm), loss/dB*km
-1≤ 200 (570nm); Light transmits under the constraint of covering in plastic optical fiber, behind the micro-porous area prepared by light arrives,
Parallel beam A at a certain angle α incides on micropore inwall, and because in hole, the refractive index of liquid is different from fiber core refractive index, thus light disperses refraction at inwall place, and refraction angle is β, and final beam A, thus has to inciding covering with incident angle γ:
Wherein
wherein n
1and n
3represent the refractive index of testing liquid in fibre core and micropore respectively.If incident angle γ equals the critical angle be totally reflected, angular relationship when total internal reflection occurs can be expressed as:
Wherein n
2represent the refractive index of fibre cladding.Now, light A propagates into covering and just defines total reflection.But when the light transmition between A and B is to covering, total reflection condition is destroyed, because produce light loss.When the refractive index in micropore increases, according to above-mentioned formula, the loss of its light reduces.Therefore by analyzing the transmissivity of light, the change of the refractive index of micropore medium can be detected in real time.
Fig. 5 is that the plastic optical fiber refractive index sensing method based on microcellular structure of the present invention is applied in refractive index detection, the relation curve of the normalized transmittance of testing liquid refractive index and light.Can find out, when the refractive index of testing liquid becomes large, the transmissivity of light significantly increases and presents obvious linear relationship.In order to optimize transducer sensitivity, we have manufactured the fibre-optical probe that micro-pore diameter is 0.15mm, 0.25mm, 0.35mm, have studied the relation of liquid refractive index to be measured and light transmission respectively.As shown in the figure, when bore dia increases, the sensitivity of sensor increases along with the increase in aperture.When micro-pore diameter is 0.35mm, change to the process of 1.475 in refractive index from 1.330, the normalized transmittance of light is increased to 0.92 from 0.65.But, in order to protect the mechanical stability of sensing arrangement, do not continue the diameter increasing micropore.
Fig. 6 is of the present invention based in the plastic optical fiber refractive index sensing method of microcellular structure, temperature stability test pattern.Sensor probe of the present invention is put into water bath with thermostatic control, then temperature is increased to 60 DEG C from 10 DEG C, and detect once the transmissivity of light every 10 DEG C.As can be seen from Figure 6, in the process that temperature increases gradually, the transmissivity receiving light does not have significant change, illustrates that this sensor maintains good stability for different temperatures.Because the fusing point of plastic optical fiber is low, we do not continue temperature when increasing.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection scope of the present invention.
Claims (9)
1. based on a plastic optical fiber index sensor for microcellular structure, it is characterized in that, this sensor comprises as the plastic optical fiber of substrate and the microcellular structure in the processing of plastic optical fiber side, and the axis of described micropore vertically crosses the axis of plastic optical fiber; Be provided with the light source that light signal is provided in one end of described plastic optical fiber, the other end of described plastic optical fiber is provided with power meter, with the power attenuation of detection light source after described plastic optical fiber is propagated.
2. a kind of plastic optical fiber index sensor based on microcellular structure according to claim 1, it is characterized in that, described plastic optical fiber is the plastic optical fiber of diameter 0.5mm.
3. a kind of plastic optical fiber index sensor based on microcellular structure according to claim 1, is characterized in that, described plastic optical fiber is the EL250 plastic optical fiber that Mitsubishi company produces.
4. a kind of plastic optical fiber index sensor based on microcellular structure according to claim 1, it is characterized in that, the parameter of described plastic optical fiber: core is PMMA, covering is fluororesin; Physical dimension is 480/500 μm; Fiber core refractive index 1.49, fibre core numerical aperture (NA) is 0.5, cladding index 1.40; Transmittance/%*m
-1>=95 (570nm), loss/dB*km
-1≤ 200 (570nm); Wavelength coverage is 420-680nm, Applicable temperature-20 DEG C ~ 70 DEG C.
5. a kind of plastic optical fiber index sensor based on microcellular structure according to claim 1, is characterized in that, the aperture of described micropore is 0.1-0.4mm.
6. a kind of plastic optical fiber index sensor based on microcellular structure according to claim 5, is characterized in that, the aperture of described micropore is 0.35mm.
7. the preparation method of an index sensor as described in any one of claim 1-6, it is characterized in that, adopt the method for existing machinery processing to cross covering and the fibre core processing micropore of whole plastic optical fiber, the axis of described micropore vertically crosses the axis of plastic optical fiber.
8. utilize index sensor as described in claim 1-6 any one to measure a method for liquid refractivity, it is characterized in that, comprise step as follows:
1) wavelength is that to be coupled to one section of internal-and external diameter through optic fibre input end mouth be in the plastic optical fiber of 480/500 μm for the LED light source of 652nm, and transmits in plastic optical fiber having under covering constraint;
2) light is behind the described micro-porous area of arrival, and light reflects through the negative lens effect of micropore, and outwards disperses and make total reflection condition destroyed, causes being optical coupling out plastic optical fiber;
3) when filling the liquid of different refractivity in micropore, its negative lens effect can be different, and then the refraction path of light can be different, and the loss of the light caused can be different; By detecting the loss receiving light, realize the Real-Time Monitoring to refractive index in micropore.
9. index sensor according to claim 8 measures the method for liquid refractivity, and it is characterized in that, extraneous testing liquid flows in described micropore by micro fluidic device; And then realize the quick Real-Time Monitoring of testing liquid refractive index to external world.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107014529A (en) * | 2017-05-24 | 2017-08-04 | 苏州至禅光纤传感技术有限公司 | Pressure sensor and pressure sensor device based on heterogeneous optical fiber |
| CN109752793A (en) * | 2017-11-03 | 2019-05-14 | 桂林电子科技大学 | Hybrid integrated Michelson formula optical fiber micro flow chip |
| CN116642612A (en) * | 2023-07-27 | 2023-08-25 | 之江实验室 | Sensor, preparation method thereof, manipulator and robot |
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| WO2009106805A1 (en) * | 2008-02-26 | 2009-09-03 | Glysure Ltd | Fibre optic sensor |
| CN102466528A (en) * | 2010-11-11 | 2012-05-23 | 香港理工大学 | Method for measuring refractive index and temperature, optical fiber sensor and corresponding manufacturing method |
| CN102809548A (en) * | 2012-08-22 | 2012-12-05 | 吉林大学 | Liquid refraction index sensing device based on microporous step multimode polymer fiber |
| CN103439293A (en) * | 2013-08-15 | 2013-12-11 | 吉林大学 | Tapering area micropore structure based single mode glass optical fiber liquid refractive index sensor |
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2014
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5489680A (en) * | 1977-12-26 | 1979-07-16 | Matsushita Electric Ind Co Ltd | Optical measuring method and optical measuring apparatus |
| WO2009106805A1 (en) * | 2008-02-26 | 2009-09-03 | Glysure Ltd | Fibre optic sensor |
| CN102466528A (en) * | 2010-11-11 | 2012-05-23 | 香港理工大学 | Method for measuring refractive index and temperature, optical fiber sensor and corresponding manufacturing method |
| CN102809548A (en) * | 2012-08-22 | 2012-12-05 | 吉林大学 | Liquid refraction index sensing device based on microporous step multimode polymer fiber |
| CN103439293A (en) * | 2013-08-15 | 2013-12-11 | 吉林大学 | Tapering area micropore structure based single mode glass optical fiber liquid refractive index sensor |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107014529A (en) * | 2017-05-24 | 2017-08-04 | 苏州至禅光纤传感技术有限公司 | Pressure sensor and pressure sensor device based on heterogeneous optical fiber |
| CN109752793A (en) * | 2017-11-03 | 2019-05-14 | 桂林电子科技大学 | Hybrid integrated Michelson formula optical fiber micro flow chip |
| CN116642612A (en) * | 2023-07-27 | 2023-08-25 | 之江实验室 | Sensor, preparation method thereof, manipulator and robot |
| CN116642612B (en) * | 2023-07-27 | 2024-01-09 | 之江实验室 | Sensor, preparation method thereof, manipulator and robot |
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Application publication date: 20150107 |